Technical parameters Head height: standard, large or small head Air pressure at the back end of the HP: 250KPa–300KPa (300KPa preferred). Air pressure at the gauge in the unit: 277-316 KPa (2.8-3.2 kgf/cm2). Water pressure: 198Kpa (2 kg). Rotation speed: 300,000-450,000 rpm. Chuck type: push button. Applicable bur: φ1.59mm~φ1.6mm×21mm~23mm (diameter×length). Noise level: ≤60dB.